Error: Saving failed for file:TempOptionSettings.opt file not found

Error: Saving failed for file:
TempOptionSettings.opt file not found
TempAutoSaveSettings.opt not found
TempAnalysisLoadModelingSettings.opt not found
TempUnitsSettings.opt not found

When storing options, the <name>.opt file is created by writing some temporary files and combining them together. In this case the temporary file can’t be saved, causing the below mentioned warning dialogs.

Most probable causes are:

• read-only (attributes) directory
• read-only temporary file
• insufficient permissions to write / create a file

Possible resolutions that have helped in similar cases:

• Check that the user who has this problem can access the folder indicated in the error message  using Windows File Explorer and has full Read/Write access.
• Check that user has permissions on the opt file itself: select the file and double-click. Go to security tab and check which permissions differ between users.
• User must have write permissions to the whole model directory.
• Check that there is Attributes sub-folder in the model folder. Without it the standard.opt is not read or written. If Attributes folder exists, try renaming it to 'attributes' so it contains only lower case characters.
• The standard.opt is not read, because it has been broken internally. Users should never modify standard.opt manually.
• Try disabling Antivirus software and check if issue persists.
• Save the model with a different name.
• Move the xs_server to another computer